How to make an SOS/Emergence call on Android phone?

Question

When you are, for instance  in a tunnel or at any other place where is no reception

Answer 1

You will be simply have to go the national number associated with emergency, as 112 in my country

You can dial, either you use a prepaid or postpaid plan, and it`s available even for the most difficult places, as mountains or tunnels, since authorities have to interfere immediately